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12 results on '"Cisneros-Lazaro, Deyanira"'

5. In-situ identification of the biomacromolecules relevant to diagenetic isotope exchange in biocalcites

Author

Cisneros-Lazaro, Deyanira, primary, Meibom, Anders, additional, Adams, Arthur, additional, Otter, Laura, additional, Daval, Damien, additional, Vennemann, Torsten, additional, Baumgartner, Lukas, additional, Stolarski, Jarosław, additional, Bernard, Sylvain, additional, Baronnet, Alain, additional, Grauby, Olivier, additional, and Raut, Hemant, additional

Published
2023
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6. 18O tracer shows diagenetic isotope exchange in biocalcites to be fast, pervasive and species-dependent

Author

Cisneros-Lazaro, Deyanira, primary, Adams, Arthur, additional, Guo, Jinming, additional, Bernard, Sylvain, additional, Baumgartner, Lukas P., additional, Daval, Damien, additional, Baronnet, Alain, additional, Grauby, Olivier, additional, Vennemann, Torsten, additional, Stolarski, Jarosław, additional, Escrig, Stéphane, additional, and Meibom, Anders, additional

Published
2022
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7. Paleoclimate reconstruction from biocalcites: the key role of microstructure and organic matter in diagenetic isotope exchange

Author

Cisneros Lazaro, Deyanira, primary, Adams, Arthur, additional, Raut, Hemant, additional, Bernard, Sylvain, additional, Baumgartner, Lukas, additional, Daval, Damien, additional, Baronnet, Alain, additional, Grauby, Olivier, additional, Vennemann, Torsten, additional, Stolarski, Jarosław, additional, Escrig, Stéphane, additional, and Meibom, Anders, additional

Published
2022
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9. Foraminifera Isotope Reequilibration Biases Paleotemperature Records

Author

Adams, Arthur, primary, Baumgartner, Lukas, additional, Vennemann, Torsten, additional, Cisneros-Lazaro, Deyanira, additional, Daval, Damien, additional, Bernard, Sylvain, additional, Guo, Jinming, additional, Baronnet, Alain, additional, Grauby, Olivier, additional, Jarek, Stolarski, additional, and Meibom, Anders, additional

Published
2021
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10. Direct imaging of diagenetic fluid penetration into benthic foraminifera tests

Author

Cisneros-Lazaro, Deyanira, primary, Adams, Arthur, additional, Guo, Jinming, additional, Bernard, Sylvain, additional, Daval, Damien, additional, Baronnet, Alain, additional, Grauby, Olivier, additional, Vennemann, Torsten, additional, Jarek, Stolarski, additional, Escrig, Stéphane, additional, Baumgartner, Lukas, additional, and Meibom, Anders, additional

Published
2021
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12. A Reassessment of of the geochemical and isotopic fidelity of biogenic carbonates

Author

Adams, Arthur, Baumgarnter, L., Vennemann, Tarek Axel, Daval, D., Bernard, Sylvain, Cisneros Lazaro, Deyanira Graciela, Baronnet, Alain, Grauby, Olivier, Guo, Jinming, Stolarski, Jaroslav, and Meibom, Anders

Abstract

Oxygen isotope compositions of calcite foraminifera tests are considered to be a robust palaeotemperature proxy at earth-surface conditions, where diffusion is slow. Recrystallization of tests during diagenesis may be optically identified and is often the basis for excluding such samples from paleotemperature calculations e.g. “glassy” vs. “frosty” foraminifera. However, biogenic and abiogenic calcite can isotopically reequilibrate and recrystallize in calcite-saturated fluids, even at low temperatures (10 mol.% of a calcite’s oxygen could exchange with oxygen from the surrounding pore fluids. The calculated temperature from the resulting reequilibrated calcite could change by as much as 4 °C depending on the pore-fluid isotopic composition, compared to the original precipitation temperature. These results compel a reconsideration of the reliability of many calcitic paleoclimate proxies even in the absence of any evidence for recrystallization. Calcite precipitated at low temperatures, e.g. benthic foraminifera, are particularly vulnerable to this process, which may, in part, explain their anomalously-high apparent equilibration temperatures during the Paleocene–Eocene.

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